Define planets, solar systems, and galaxies
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Earth Science › Define planets, solar systems, and galaxies
Which of the following is the primary difference between a planet and a moon?
a planet revolves around a star and a moon revolves around a planet
a planet rotates and a moon does not
planets are part of the solar system but moons are part of the asteroid belt
all of these
none of these
Explanation
Star - A ball of hydrogen gas held together by gravity. The central core of a star is extremely hot and produces energy. Some of this energy is released as visible light, which makes the star glow
Planet - a celestial body moving in an elliptical orbit around a star
Solar System - a collection of planets and their moons in orbit around a star, together with smaller bodies in the form of asteroids, meteoroids, and comets
Galaxy - a system of millions or billions of stars and the solar systems within them, together with gas and dust, held together by gravitational attraction
Which of the following answer choices is a satellite that orbits a planet and reflects light from a star?
a moon
another planet
a star
an asteroid
Explanation
The answer is "a moon" because moons revolve around planets.
Star - A ball of hydrogen gas held together by gravity. The central core of a star is extremely hot and produces energy. Some of this energy is released as visible light, which makes the star glow.
Planet - a celestial body moving in an elliptical orbit around a star
Solar System - a collection of planets and their moons in orbit around a star, together with smaller bodies in the form of asteroids, meteoroids, and comets.
Galaxy - a system of millions or billions of stars and the solar systems within them, together with gas and dust, held together by gravitational attraction
Where would a new star likely form?
in a nebula
inside a blackhole
in a supernova
in a pulsar
Explanation
The answer is "in a nebula" because a nebula is a cloud of interstellar dust, hydrogen and helium, the components of star.
Star - A ball of hydrogen gas held together by gravity. The central core of a star is extremely hot and produces energy. Some of this energy is released as visible light, which makes the star glow.
Planet - a celestial body moving in an elliptical orbit around a star
Solar System - a collection of planets and their moons in orbit around a star, together with smaller bodies in the form of asteroids, meteoroids, and comets.
Galaxy - a system of millions or billions of stars and the solar systems within them, together with gas and dust, held together by gravitational attraction
Which of the following is the best description of the Milky Way Galaxy?
a spiral shaped cloud of billions of stars
the portion of space filled with asteroids just past Jupiter
a type of nebula
a collection of planets that rotates around a single star
Explanation
The answer is "a spiral shaped cloud of billions of stars."
Star - A ball of hydrogen gas held together by gravity. The central core of a star is extremely hot and produces energy. Some of this energy is released as visible light, which makes the star glow.
Planet - a celestial body moving in an elliptical orbit around a star
Solar System - a collection of planets and their moons in orbit around a star, together with smaller bodies in the form of asteroids, meteoroids, and comets.
Galaxy - a system of millions or billions of stars and the solar systems within them, together with gas and dust, held together by gravitational attraction
Which of the following images best represents a galaxy?
Explanation
Star - A ball of hydrogen gas held together by gravity. The central core of a star is extremely hot and produces energy. Some of this energy is released as visible light, which makes the star glow.
Planet - a celestial body moving in an elliptical orbit around a star
Solar System - a collection of planets and their moons in orbit around a star, together with smaller bodies in the form of asteroids, meteoroids, and comets.
Galaxy - a system of millions or billions of stars and the solar systems within them, together with gas and dust, held together by gravitational attraction
What characteristics are shared by the first four planets in our solar system?
They are solid and rocky.
They are large and gaseous.
They have similar length of day.
They all have many moons.
Explanation
The answer is "They are solid and rocky."
Star - A ball of hydrogen gas held together by gravity. The central core of a star is extremely hot and produces energy. Some of this energy is released as visible light, which makes the star glow.
Planet - a celestial body moving in an elliptical orbit around a star
Solar System - a collection of planets and their moons in orbit around a star, together with smaller bodies in the form of asteroids, meteoroids, and comets.
Galaxy - a system of millions or billions of stars and the solar systems within them, together with gas and dust, held together by gravitational attraction
Which of the following lists of objects contains only space objects that reflect light?
moons, planets, comets
moons, suns, comets
suns, volcanic planets, asteroids
suns, moons, stars
Explanation
The answer is "moons, planets, comets."
Star - A ball of hydrogen gas held together by gravity. The central core of a star is extremely hot and produces energy. Some of this energy is released as visible light, which makes the star glow.
Planet - a celestial body moving in an elliptical orbit around a star
Solar System - a collection of planets and their moons in orbit around a star, together with smaller bodies in the form of asteroids, meteoroids, and comets.
Galaxy - a system of millions or billions of stars and the solar systems within them, together with gas and dust, held together by gravitational attraction
Which of the following lists celestial bodies in order from smallest to largest?
planet, star, solar system, galaxy, universe
star, planet, solar system, galaxy, universe
planet, solar system, star, galaxy, universe
planet, galaxy, solar system, star, universe
Explanation
Star - A ball of hydrogen gas held together by gravity. The central core of a star is extremely hot and produces energy. Some of this energy is released as visible light, which makes the star glow.
Planet - a celestial body moving in an elliptical orbit around a star
Solar System - a collection of planets and their moons in orbit around a star, together with smaller bodies in the form of asteroids, meteoroids, and comets.
Galaxy - a system of millions or billions of stars and the solar systems within them, together with gas and dust, held together by gravitational attraction
Which of the following terms is defined as, "a ball of hydrogen gas held together by gravity. The central core of is extremely hot and produces energy"?
a star
a gas planet
a nebula
a galaxy
Explanation
Star - A ball of hydrogen gas held together by gravity. The central core of a star is extremely hot and produces energy. Some of this energy is released as visible light, which makes the star glow
Planet - a celestial body moving in an elliptical orbit around a star
Solar System - a collection of planets and their moons in orbit around a star, together with smaller bodies in the form of asteroids, meteoroids, and comets
Galaxy - a system of millions or billions of stars and the solar systems within them, together with gas and dust, held together by gravitational attraction
Which of the following best defines the term "galaxy?"
a system of millions or billions of stars and the solar systems within them, together with gas and dust, held together by gravitational attraction
a celestial body moving in an elliptical orbit around a star
a collection of planets and their moons in orbit around a star, together with smaller bodies in the form of asteroids, meteoroids, and comets
ball of hydrogen gas held together by gravity. The central core is extremely hot and produces energy. Some of this energy is released as visible light, which makes it glow
Explanation
Star - A ball of hydrogen gas held together by gravity. The central core of a star is extremely hot and produces energy. Some of this energy is released as visible light, which makes the star glow
Planet - a celestial body moving in an elliptical orbit around a star
Solar System - a collection of planets and their moons in orbit around a star, together with smaller bodies in the form of asteroids, meteoroids, and comets
Galaxy - a system of millions or billions of stars and the solar systems within them, together with gas and dust, held together by gravitational attraction